CN209836108U - Natural gas purification system - Google Patents
Natural gas purification system Download PDFInfo
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- CN209836108U CN209836108U CN201920646496.8U CN201920646496U CN209836108U CN 209836108 U CN209836108 U CN 209836108U CN 201920646496 U CN201920646496 U CN 201920646496U CN 209836108 U CN209836108 U CN 209836108U
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Abstract
The application relates to the field of chemical industry, particularly relates to a natural gas purification system. The natural gas purification system comprises an MDEA deacidification device, a TSA dehydration and dealkylation device and a TSA dealkylation protection device; the TSA dehydration and dealkylation device is connected between the MDEA deacidification device and the TSA dealkylation protection device, and the TSA dealkylation protection device can dehydrate and remove heavy hydrocarbons again on the gas output by the TSA dehydration and dealkylation device; part of the product gas output by the TSA dealkylation protection device or the TSA dealkylation device can be input into the TSA dealkylation protection device again as regeneration gas to regenerate the adsorbent. The regenerated gas can be input into the TSA dealkylation protection device again for adsorbent regeneration, can avoid leading to heavy hydrocarbon and water to get into the cold box because the adsorbent reaches saturation and cause freezing stifled.
Description
Technical Field
The application relates to the field of chemical industry, particularly relates to a natural gas purification system.
Background
Liquefied Natural Gas (LNG), which is purified natural gas, is compressed and cooled to its boiling point (-161.5 degrees celsius) to become liquid, and is usually stored in a cryogenic storage tank at-161.5 degrees celsius and about 0.1 MPa.
The natural gas contains heavy hydrocarbon and water, adopts conventional one step adsorption process natural gas purification process, and along with the lapse of time, adsorbent ability descends, takes off heavy hydrocarbon nonconforming, finally causes the cold box and freezes stifled.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of this application is to provide a natural gas clean system, it aims at improving the easy stifled problem of freezing of current natural gas purification's cold box.
The application provides a natural gas purification system in a first aspect, which comprises an MDEA deacidification device, a TSA dehydration and dealkylation device and a TSA dealkylation protection device; the TSA dehydration and dealkylation device is connected between the MDEA deacidification device and the TSA dealkylation protection device, and the TSA dealkylation protection device can dehydrate and remove heavy hydrocarbons again on the gas output by the TSA dehydration and dealkylation device; the TSA dealkylation protection device or part of the product gas output by the TSA dealkylation protection device can be input into the TSA dealkylation protection device again as regeneration gas to regenerate the adsorbent.
The TSA dealkylation protection device is used for carrying out dehydration and heavy hydrocarbon removal on the gas output by the TSA dealkylation device again; part of the product gas output by the TSA dealkylation protection device can be input into the TSA dealkylation protection device again as regeneration gas to regenerate the adsorbent; can be under the condition of whole natural gas clean system continuous operation to adsorbent regeneration, it is incomplete to have avoided the desorption of heavy hydrocarbon and water, can avoid leading to heavy hydrocarbon and water to get into the cold box because the adsorbent reaches the saturation and cause to freeze stifled.
In some embodiments of the first aspect of the present application, the TSA de-hydrocarbon guard as described above comprises:
at least two de-hydrocarbon towers, wherein the de-hydrocarbon towers are used for re-dehydrating and de-heavy hydrocarbon gas output by the TSA dehydration de-hydrocarbon device;
the regeneration gas inlet pipe is connected with the dealkylation tower and is used for conveying regeneration gas to the dealkylation tower; and
and the regeneration gas outlet pipe is used for outputting gas after the adsorbent is regenerated.
TSA takes off hydrocarbon protection device and dewaters once more, takes off the heavy hydrocarbon, and the regeneration gas is carried to the regeneration gas intake pipe, and the regeneration gas is to taking off the adsorbent regeneration in the hydrocarbon tower, no longer has the dehydration after avoiding the adsorbent saturation, takes off the effect of heavy hydrocarbon, avoids heavy hydrocarbon and water to get into the liquefaction system.
In some embodiments of the first aspect of the present application, the outlet end of the regeneration gas outlet pipe is connected to the inlet of the MDEA deacidification device or the inlet of the TSA dehydration and dealkylation device.
In some embodiments of the first aspect of the present application, the above TSA dealkylation protection device further comprises a first regeneration gas cooler and a first regeneration gas separator connected in sequence, and the outlet end of the regeneration gas outlet pipe is connected to the first regeneration gas cooler; the first regeneration gas separator is used for carrying out gas-liquid separation on the regenerated gas.
The gas output from the gas outlet end of the regenerated gas outlet pipe can be conveyed to a natural gas deacidification device or a TSA dehydration and dealkylation device, so that the regenerated gas is recycled, the cost is reduced, and the environment is protected. The first regeneration gas cooler liquefies heavy hydrocarbons and water in the regenerated gas; the first regeneration gas separator is mainly used for separating gas and liquid in a regeneration gas outlet pipe, separating the liquid from the gas, and then conveying the gas to a natural gas deacidification device or a TSA (TSA dehydration and dealkylation) device; avoid the heavy hydrocarbon in the regeneration gas and water to get into natural gas clean system once more, avoid the unnecessary energy consumption.
In some embodiments of the first aspect of the present application, the natural gas de-hydrocarbon protection device further comprises a first regeneration gas heater installed between the inlet end of the regeneration gas inlet pipe and the outlet end of the regeneration gas inlet pipe.
First regeneration gas heater installs in the regeneration gas intake pipe, for the gaseous heating of the regeneration gas intake pipe of flowing through, increases the regeneration effect of regeneration gas to the adsorbent, promotes the desorption of the heavy hydrocarbon in the adsorbent and water.
In some embodiments of the first aspect of the present application, the natural gas purification system further includes a regeneration gas compression device, and the regeneration gas compression device is configured to pressurize the gas output by the regeneration gas outlet pipe.
The regenerated gas compression device can pressurize gas entering the MDEA deacidification device and the TSA dehydration and dealkylation device, and the pressurized gas can smoothly enter the MDEA deacidification device and the TSA dehydration and dealkylation device.
In some embodiments of the first aspect of the present application, the above TSA dehydration and dealkylation apparatus comprises:
at least two adsorption towers, wherein the adsorption towers are used for dehydrating and removing heavy hydrocarbon from the gas output by the MDEA deacidification device;
the regeneration gas feeding pipe is connected with the adsorption tower and is used for conveying regeneration gas to the adsorption tower; and
and the regeneration gas discharging pipe is used for outputting the regenerated gas in the adsorption tower.
The regenerated gas feed pipe can convey regenerated gas to an adsorption tower of the TSA dehydration and dealkylation device, and the adsorbent is regenerated and then output through a regenerated gas discharge pipe. Heavy hydrocarbons and water entering the liquefaction system due to saturation of the adsorbent can be avoided.
In some embodiments of the first aspect of the present application, the outlet of the regeneration gas outlet pipe is connected to the inlet of the TSA dehydration and dealkylation plant.
The gas at the outlet of the regenerated gas discharge pipe is input into the natural gas dehydration and dealkylation device again for recycling, so that waste is avoided.
In some embodiments of the first aspect of the present application, the above TSA dehydration and hydrocarbon removal apparatus further comprises a second regeneration gas cooler and a second regeneration gas separator connected in sequence, wherein an outlet of the regeneration gas outlet pipe is connected to the second regeneration gas cooler, and the second regeneration gas separator is used for gas-liquid separation of the regenerated gas.
In some embodiments of the first aspect of the present application, the above TSA dehydration and dealkylation apparatus further comprises a second regeneration gas heater for heating the regeneration gas
The second regeneration gas cooler enables heavy hydrocarbon and water to be cooled, then the heavy hydrocarbon, the water and the gas are separated through the second regeneration gas separator, and the gas obtained after separation is input into the natural gas dehydration and hydrocarbon removal device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 shows a schematic block diagram of a first embodiment of a natural gas purification system provided in an example of the present application;
FIG. 2 shows a schematic structural diagram of a first embodiment of a natural gas purification system provided in an example of the present application;
FIG. 3 shows a schematic structural diagram of a natural gas de-hydrocarbon protection device provided by an embodiment of the application;
FIG. 4 shows a schematic diagram of a TSA dehydration and dealkylation plant provided by an embodiment of the present application;
FIG. 5 shows a block flow diagram of a first embodiment of a natural gas purification system provided by an example of the present application;
fig. 6 shows a block flow diagram of a second embodiment of a natural gas purification system provided in an example of the present application.
Icon: 100-natural gas purification system; 101-MDEA deacidification device; 102-natural gas liquefaction plant; 103-a regeneration gas compression unit; 110-TSA dehydration and dealkylation device; 200-TSA dealkylation protection device; 201-a first valve; 202-a second valve; 203-a third valve; 204-a fourth valve; 205-a fifth valve; 206-a sixth valve; 210-a first de-hydrocarbonation column; 211-a first inlet duct; 212-a first outlet duct; 213-a first outlet valve; 220-a second de-hydrocarbonation column; 221-a second intake pipe; 222-a second outlet pipe; 223-a second outlet valve; 230-a regeneration gas inlet pipe; 240-regenerated gas outlet pipe; 250-a first regeneration gas separator; 251-a first regeneration gas condenser; 260-a first regeneration gas heater; 301-regulating valve; 302-branch pipe; 310-a first adsorption column; 320-a second adsorption column; 330-a third adsorption column; 340-a regeneration gas outlet pipe; 350-a second regeneration gas separator; 351-a second regeneration gas condenser; 360-second regeneration gas heater.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Examples
FIG. 1 shows a schematic block diagram of a first embodiment of a natural gas purification system 100 provided in an example of the present application; fig. 2 is a schematic structural diagram illustrating a first embodiment of a natural gas purification system 100 according to an embodiment of the present application, and referring to fig. 1 and fig. 2, the embodiment of the present application provides a natural gas purification system 100, which is mainly used for purifying natural gas.
The natural gas purification system 100 includes a TSA dehydration and dealkylation apparatus 110, a TSA dealkylation guard 200, and an MDEA deacidification apparatus 101. The outlet of the TSA dehydration and dealkylation device 110 is connected with the inlet of the TSA dealkylation protection device 200; the inlet of the TSA dehydration and dealkylation device 110 is connected with the outlet of the MDEA deacidification device 101; the outlet of the TSA de-hydrocarbon guard 200 may be connected to the natural gas liquefaction plant 102.
TSA dehydration takes off hydrocarbon device 110 mainly used dehydration, takes off the heavy hydrocarbon, and TSA takes off hydrocarbon protection device 200 mainly used will dewater again, take off the gas dehydration behind the heavy hydrocarbon and take off the heavy hydrocarbon, avoids the filler saturation back water in the TSA dehydration takes off hydrocarbon device 110 and heavy hydrocarbon entering natural gas liquefaction device 102 to lead to the cold box to freeze stifled.
The structure of the TSA de-hydrocarbon guard 200 provided in the examples of the present application is described below.
Fig. 3 shows a schematic structural diagram of a TSA dealkylation protection device 200 provided by an embodiment of the present application, please refer to fig. 3.
In the embodiments of the present application, the TSA dealkylation guard 200 comprises two dealkylation columns, namely a first dealkylation column 210, a second dealkylation column 220; the first dealkylation column 210 is provided with a first inlet pipe 211 and a first outlet pipe 212, the first inlet pipe 211 being provided with a first valve 201, and the first outlet pipe 212 being provided with a first outlet valve 213.
The second dealkylation tower 220 is provided with a second gas inlet pipe 221 and a second gas outlet pipe 222, and the second gas inlet pipe 221 is provided with a second valve 202; the second outlet duct 222 is provided with a second outlet valve 223.
The first inlet pipe 211 is connected to the TSA dehydration and dealkylation apparatus 110 through the first valve 201, and the first outlet pipe 212 is used for outputting the gas in the first dealkylation column 210. A second gas inlet pipe 221 is connected to the TSA dehydration and dealkylation apparatus 110 through the second valve 202, and a second gas outlet pipe 222 is used for outputting the gas in the second dealkylation tower 220. The first and second dealkylation towers 210 and 220 are mainly used for further dehydrating and dealkylating the heavy hydrocarbons of the gas after the heavy hydrocarbons and the water are removed from the TSA water and hydrocarbon removing device 110.
The regeneration gas inlet pipe 230 is connected to the first and second dealkylation towers 210 and 220 through the fifth and sixth valves 205 and 206, respectively. Whether regeneration gas is required to be delivered into the first dealkylation tower 210 or the second dealkylation tower 220 is controlled by the first gas outlet valve 213, the second gas outlet valve 223, the fifth valve 205 and the sixth valve 206.
The first and second dealkylation towers 210 and 220 are connected to a regeneration gas outlet pipe 240 through third and fourth valves 203 and 204, respectively. The gas in the first or second dealkylation tower 210 or 220 is controlled to be output from the regeneration gas outlet pipe 240 through the first, second, third and fourth valves 201, 202, 203 and 204. The TSA dealkylation protection device 200 is used for removing heavy hydrocarbon and part of dehydrated product gas, namely, one of the two dealkylation towers is used for removing heavy hydrocarbon and dehydration, then the part of the product gas after heavy hydrocarbon and dehydration is taken as regenerated gas and is conveyed into the other dealkylation tower through the gas outlet valve to regenerate the adsorbent, and after a period of time, the flowing directions of the gas in the two dealkylation towers are exchanged.
The TSA dealkylation protection device 200 simultaneously regenerates the adsorbent in the process of removing heavy hydrocarbon and dehydration, and removes heavy hydrocarbon and dehydration by adopting a dealkylation tower where the regenerated adsorbent is positioned after a period of time; ensure the low content of heavy hydrocarbon and water in the gas and avoid the freezing and blocking of the cold box.
In this embodiment, the TSA dealkylation guard 200 comprises two dealkylation columns. In other embodiments of the present application, the TSA dealkylation guard 200 may comprise three, four, six, etc. dealkylation columns, each equipped with an inlet pipe and an outlet pipe; the gas outlet pipe of each dealkylation tower is provided with a gas outlet valve; each air outlet valve is connected with the air inlet end of the regenerated gas inlet pipe 230, and each air outlet pipe is connected with the air outlet end of the regenerated gas inlet pipe 230 through a valve.
Correspondingly, among the embodiment that TSA dealkylation protection device 200 includes a plurality of dealkylation towers, at least one in a plurality of dealkylation towers takes off heavy hydrocarbon, dehydration, and the back will take off heavy hydrocarbon, the partial product gas after the dehydration is carried through the air outlet valve as the regeneration gas and is regenerated the adsorbent in remaining dealkylation towers, after a period, changes, so circulate, can avoid because the adsorbent reaches the saturation and lead to heavy hydrocarbon and water to get into the cold box of liquefaction system and cause freezing stifled.
In other words, when the TSA dealkylation guard 200 is operated, the adsorbent in the dealkylation column does not need to be regenerated at all times, and for example, when the start-up is started, the adsorbent is not saturated and may not be regenerated.
In some embodiments of the present application, the TSA de-hydrocarbon guard 200 further comprises a first regeneration gas heater 260. The first regeneration gas heater 260 is installed in the regeneration gas inlet pipe 230, and heats the gas flowing through the regeneration gas inlet pipe 230 (for example, to 240 ℃ or higher), thereby increasing the regeneration effect of the regeneration gas on the adsorbent and promoting the desorption of the heavy hydrocarbon and water in the adsorbent.
As described above, when the regeneration gas inlet pipe 230 supplies the regeneration gas to the first dealkylation tower 210, the fifth valve 205 is opened, so that the gas after the adsorbent regeneration in the first dealkylation tower 210 is output from the regeneration gas outlet pipe 240; accordingly, when the regeneration gas inlet pipe 230 supplies the regeneration gas to the second dealkylation tower 220, the sixth valve 206 is opened, so that the gas after the adsorbent regeneration in the second dealkylation tower 220 is output from the regeneration gas outlet pipe 240.
In some embodiments of the present application, the outlet end of the regeneration gas outlet pipe 240 is connected to the inlet of the MDEA deacidification device 101 or the inlet of the TSA dehydration and dealkylation device 110.
In other words, the gas output from the outlet end of the regenerated gas outlet pipe 240 can be conveyed to the MDEA deacidification device 101 or the TSA dehydration and dealkylation device 110, so that the regenerated gas can be reused, the cost is reduced, and the environment is protected.
It is understood that in other embodiments of the present application, the outlet end of the regeneration gas outlet pipe 240 may be connected to other devices, such as an inlet of a boiler, for other purposes.
Further, the TSA dealkylation protection device 200 further comprises a first regeneration gas condenser 251 and a first regeneration gas separator 250 which are connected in sequence, and the gas outlet end of the regeneration gas outlet pipe 240 is connected with the first regeneration gas condenser 251; the first regeneration gas separator 250 is connected to the inlet of the MDEA deacidification apparatus 101 or the inlet of the TSA dehydration and dealkylation apparatus 110.
One operational state of the TSA de-hydrocarbon guard 200 when in use is described below.
The first valve 201, the first outlet valve 213, the sixth valve 206 and the fourth valve 204 are open; the second valve 202, the third valve 203, the fifth valve 205, and the second outlet valve 223 are closed.
The first dealkylation tower 210 removes heavy hydrocarbons from the gas passing through the TSA dehydration and dealkylation apparatus 110, and removes heavy hydrocarbons and water from the dehydrated gas again; a part of the gas output from the first gas outlet pipe 212 is used as regeneration gas, is heated by a first regeneration gas heater 260, enters a second dealkylation tower 220 through a sixth valve 206, regenerates the adsorbent in the tower, flows out through a fourth valve 204, is cooled by a first regeneration gas condenser 251 (for example, the regeneration gas is cooled to 0-20 ℃), makes heavy hydrocarbon and water condensed, is separated by a first regeneration gas separator 250, and is then conveyed to the MDEA deacidification device 101 or the TSA dealkylation dehydration device 110.
After a period of time, the first valve 201, the first outlet valve 213, the sixth valve 206 and the fourth valve 204 are closed; the second valve 202, the third valve 203, the fifth valve 205, and the second gas outlet valve 223 are opened. The regeneration gas enters the first de-hydrocarbon tower 210 to regenerate the adsorbent in the tower, and during the period of time, the second de-hydrocarbon tower 220 is de-heavy hydrocarbon and dehydrated. And the process is circulated.
In some embodiments of the present application, the natural gas purification system 100 further comprises a regeneration gas compression device 103, and the regeneration gas compression device 103 is connected to an outlet of the regeneration gas outlet pipe 240.
The gas output by the regenerated gas outlet pipe 240 enters the regenerated gas compression device 103, and the compressed gas is beneficial to conveying and can more easily enter the MDEA deacidification device 101 or the TSA dehydration and dealkylation device 110.
In the embodiment of the present application, the adsorbent in the first and second dealkylation towers 210 and 220 may be activated carbon, molecular sieve, silica gel, or the like. The first dealkylation tower 210 and the second dealkylation tower 220 are packed towers, and the inner structures of the first dealkylation tower 210 and the second dealkylation tower 220 are seen from the desorption tower for heavy hydrocarbon and water in natural gas purification, which will not be described in detail in this embodiment.
The structure of the TSA dehydration and dealkylation apparatus 110 provided in the examples of the present application is described below.
Fig. 4 shows a schematic configuration diagram of a TSA dehydration and dealkylation apparatus 110 provided in an example of the present application, and fig. 5 shows a block flow diagram of a first embodiment of a natural gas purification system 100 provided in an example of the present application; please refer to fig. 3 to 5.
Based on the above, the TSA dehydration and dealkylation device 110 is mainly used for removing heavy hydrocarbons and dehydrating natural gas, and the gas after heavy hydrocarbons and dehydration in the TSA dehydration and dealkylation device 110 is transported to the TSA dealkylation protection device 200.
In the present embodiment, the TSA dehydration and dealkylation apparatus 110 includes three adsorption columns, i.e., a first adsorption column 310, a second adsorption column 320, and a third adsorption column 330.
The first adsorption tower 310, the second adsorption tower 320 and the third adsorption tower 330 are all connected with a discharge pipeline of the MDEA deacidification device 101 through pipelines.
The first adsorption tower 310, the second adsorption tower 320 and the third adsorption tower 330 are all connected with the regeneration gas outlet pipe 340 through valves, so that the regeneration gas of the first adsorption tower 310, the second adsorption tower 320 and the third adsorption tower 330 can be output through the regeneration gas outlet pipe 340.
In the embodiment of the present application, TSA dehydration and dealkylation apparatus 110 further comprises a second regeneration gas condenser 351 and a second regeneration gas separator 350 connected in sequence, wherein a regeneration gas discharging pipe 340 is connected with the second regeneration gas condenser 351, the second regeneration gas condenser 351 is connected with the second regeneration gas separator 350, the second regeneration gas condenser 351 cools the gas containing the heavy hydrocarbon and the water output by the regeneration gas discharging pipe 340 to liquefy the heavy hydrocarbon and the water, the second regeneration gas separator 350 is used for separating the gas containing the heavy hydrocarbon and the water output by the regeneration gas discharging pipe 340, and the outlet of the second regeneration gas separator 350 is connected with the gas inlet of TSA dehydration and dealkylation apparatus 110. In this embodiment, the TSA dehydration and dealkylation apparatus 110 comprises two second regeneration gas condensers 351 for two-stage cooling of the gas containing heavy hydrocarbons and water outputted from the regeneration gas discharge pipe 340.
Adopt second regeneration gas separator 350 separation heavy hydrocarbon and water, can avoid getting from the adsorbent desorption water and heavy hydrocarbon reentrant natural gas purification system 100, increase the load of the desorption of adsorbent, practice thrift the cost.
In this embodiment, the TSA dehydration and dealkylation apparatus 110 further comprises a regulating valve 301; the regeneration gas outlet pipe 340 is connected with the outlet of the regulating valve 301. The first adsorption column 310, the second adsorption column 320, and the third adsorption column 330 are connected via a branch pipe 302, and an inlet of the branch pipe 302 is provided at the inlet front end of the regulating valve 301.
Correspondingly, the outlets of the first adsorption column 310, the second adsorption column 320 and the third adsorption column 330 are connected with the TSA dealkylation protection device 200 through valves.
In this embodiment, the TSA dehydration dealkylation apparatus 110 further comprises a second regeneration gas heater 360, the second regeneration gas heater 360 being used to heat the regeneration gas; the heated regeneration gas is carried into the first adsorption tower 310, the second adsorption tower 320 or the third adsorption tower 330.
An operation state of the TSA dehydration and dealkylation apparatus 110 in use will be described below. The gas output by the discharge pipeline of the MDEA deacidification device 101 enters a TSA dehydration and dealkylation device 110 to remove heavy hydrocarbon and dehydrate.
The regulating valve 301 is opened, the gas output by the discharge pipeline of the MDEA deacidification device 101 only enters the first adsorption tower 310, and the first adsorption tower 310 performs adsorption; after adsorption, it is sent to TSA de-hydrocarbonization guard 200.
A valve connected with the second adsorption tower 320 on the branch pipe 302 is opened, desorption, namely cold blowing, is carried out on the adsorbent in the second adsorption tower 320, and the gas output by the second adsorption tower 320 is heated by a second regenerated gas heater 360; the heated gas then enters the third adsorption tower 330 (in fig. 4, enters from the lower end of the third adsorption tower 330), and the adsorbent in the third adsorption tower 330 is desorbed and regenerated; after regeneration, the heavy hydrocarbon is conveyed to a second regeneration gas condenser 351 and a second regeneration gas separator 350 through a regeneration gas outlet pipe 340, and the heavy hydrocarbon and water are separated by the second regeneration gas separator 350; and then to the outlet of the regulator valve 301.
In other words, the first adsorption tower 310 adsorbs the gas, the second adsorption tower 320 performs "cold blowing", and the third adsorption tower 330 performs adsorbent regeneration.
After a period of time, the temperature of the third adsorption tower 330 needs to be reduced, and the third adsorption tower 330 is subjected to cold blowing by adjusting valves connected with the first adsorption tower 310, the second adsorption tower 320 and the third adsorption tower 330, so that the first adsorption tower 310 performs adsorbent regeneration, and the second adsorption tower 320 performs adsorption, dehydration and heavy hydrocarbon removal. By the circulation, the phenomenon that the adsorbent cannot be subjected to heavy hydrocarbon removal and dehydration after reaching saturation is avoided, and freezing and blocking of the cold box are avoided.
In other embodiments of the present application, the TSA dehydration de-hydrocarbon apparatus 110 may also comprise two, four, six, etc. adsorption columns. As described above, in the process of using the TSA dehydration/dealkylation apparatus 110, at least one of the plurality of adsorption columns performs heavy hydrocarbon removal and dehydration.
After a period of time, change and take off the adsorption tower of heavy hydrocarbon, dehydration and carry out adsorbent regeneration's adsorption tower, so circulation can avoid leading to heavy hydrocarbon and water to get into the cold box because the adsorbent reaches the saturation and causes to freeze stifled.
Fig. 6 shows a block flow diagram of a second embodiment of the natural gas purification system 100 provided in the examples of the present application, please refer to fig. 6.
The TSA dehydration/dealkylation apparatus 110 and the TSA dealkylation guard 200 in the present embodiment are the same as those in the first embodiment, and will not be described again.
The second embodiment differs from the first embodiment in one of the following points:
in this embodiment, the natural gas purification system 100 does not include the regenerated gas compression device 103, the natural gas purification system 100 further includes a natural gas compression unit, and the gas output by the regenerated gas outlet pipe 240 is connected with the gas inlet end of the natural gas compression unit, is conveyed to the natural gas compression unit, and then enters the MDEA deacidification device 101.
It should be noted that, in the present application, the adsorption tower, the dealkylation tower, the compressor, the separator, the heater, and the like may all adopt apparatuses common in the chemical industry, and the pressure gauge, the valve, the auxiliary pipeline, and the like that need to be arranged in the natural gas purification system 100 may all be arranged as required, and this embodiment will not be described again; accordingly, the connection described in this application may be a suitable connection mode in the chemical equipment, and this embodiment will not be described again.
The natural gas purification system 100 provided by the embodiment of the application has the main advantages that:
the TSA dealkylation protection device 200 dehydrates and removes heavy hydrocarbons again for the gas output by the TSA dealkylation device 110; part of the product gas output by the TSA dealkylation protection device 200 can be input into the TSA dealkylation protection device 200 again as regeneration gas to carry out adsorbent regeneration; the adsorbent can be regenerated under the condition that the whole natural gas purification system 100 continuously operates, incomplete removal of heavy hydrocarbon and water is avoided, and heavy hydrocarbon and water entering the natural gas liquefaction device 102 caused by saturation of the adsorbent can be avoided.
TSA takes off hydrocarbon protection device 200 in a plurality of dealkylation towers at least one take off heavy hydrocarbon, dehydration, the back will take off heavy hydrocarbon, the partial gas after the dehydration carries through the air outlet valve and regenerates the adsorbent in remaining dealkylation towers, exchanges after a period, so circulate, can avoid because the adsorbent reaches the saturation and lead to heavy hydrocarbon and water to get into natural gas liquefaction device 102 and freeze stifled.
The TSA dehydration and dealkylation device 110 comprises a plurality of adsorption towers, wherein through the matching of valves such as a regenerated gas feeding pipe, a branch pipe 302, a regenerated gas discharging pipe 340, an adjusting valve 301 and the like, part of the adsorption towers are subjected to heavy hydrocarbon removal and dehydration, and meanwhile, the rest of the adsorption towers are subjected to adsorbent regeneration and exchange after a period of time; ensure the low content of heavy hydrocarbon and water in the gas and avoid the freezing and blocking of the cold box. By the circulation, the phenomenon that the adsorbent cannot be subjected to heavy hydrocarbon removal and dehydration after reaching saturation is avoided, and freezing and blocking of the cold box are avoided.
The application also provides a natural gas purification method, which comprises the following steps:
introducing the raw material gas after deacidification, dehydration and dealkylation into a TSA dealkylation protection device to dehydrate and dealkylate again, wherein the TSA dealkylation protection device comprises at least two dealkylation towers to remove hydrocarbons again;
and (3) introducing part of gas output by the TSA dealkylation protection device into a partial dealkylation tower in the TSA dealkylation protection device to regenerate the adsorbent.
Further, the gas obtained by regenerating the adsorbent is sent to the inlet of the MDEA deacidification apparatus or the inlet of the TSA dehydration and hydrocarbon removal apparatus again.
Further, in this embodiment, the natural gas deacidified by the MDEA deacidification apparatus enters a TSA dehydration and dealkylation apparatus, and the natural gas dehydrated and dealkylated to heavy hydrocarbons then enters a TSA dealkylation protection apparatus. The adsorption tower after heating and regeneration enters a dehydration and dealkylation heater to be heated to 240 ℃ after being subjected to cold blowing of regeneration gas, enters an adsorption tower heating adsorbent bed layer to be heated, enters a regeneration gas cooler to be cooled to 40 ℃, then enters a regeneration gas subcooler to be cooled to 12 ℃, then enters a dehydration and dealkylation regeneration gas separator to separate water and heavy hydrocarbon, and then returns to the inlet of the dehydration and dealkylation tower.
The natural gas from the dehydration and dealkylation unit enters a dealkylation tower of a TSA dealkylation protection device, and the purified natural gas after adsorption of a protection bed layer is sent to a liquefaction unit. Introducing regeneration gas into the bed layer after adsorption saturation for heating, then cooling the bed layer to 40 ℃ by a de-hydrocarbon protection regeneration gas cooler, and then pressurizing the bed layer by a de-hydrocarbon protection regeneration gas compressor and returning the bed layer to the inlet of the MDEA deacidification device.
The TSA dealkylation protection device dehydrates heavy hydrocarbon again, so that the heavy hydrocarbon can be removed more completely, and part of gas output by the TSA dealkylation protection device is introduced into a part of dealkylation tower in the TSA dealkylation protection device to regenerate the adsorbent; can avoid causing because adsorbent reaches saturation heavy hydrocarbon and water get into the cold box and freeze stifled.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A natural gas purification system is characterized by comprising an MDEA deacidification device, a TSA dehydration and dealkylation device and a TSA dealkylation protection device; the TSA dehydration and dealkylation device is connected between the MDEA deacidification device and the TSA dealkylation protection device, and the TSA dealkylation protection device can dehydrate and remove heavy hydrocarbons again on the gas output by the TSA dehydration and dealkylation device; the TSA dealkylation protection device or part of the product gas output by the TSA dealkylation protection device can be input into the TSA dealkylation protection device again as regeneration gas to regenerate the adsorbent.
2. The natural gas purification system of claim 1,
the TSA de-hydrocarbon protection unit comprises:
at least two de-hydrocarbon towers, wherein the de-hydrocarbon towers are used for re-dehydrating and de-heavy hydrocarbon gas output by the TSA dehydration de-hydrocarbon device;
the regeneration gas inlet pipe is connected with the dealkylation tower and is used for conveying regeneration gas to the dealkylation tower; and
and the regeneration gas outlet pipe is used for outputting gas after the adsorbent is regenerated.
3. The natural gas purification system of claim 2,
and the gas outlet end of the regenerated gas outlet pipe is connected with the gas inlet of the MDEA deacidification device or the gas inlet of the TSA dehydration and dealkylation device.
4. The natural gas purification system of claim 3,
the TSA dealkylation protection device also comprises a first regeneration gas cooler and a first regeneration gas separator which are sequentially connected, and the gas outlet end of the regeneration gas outlet pipe is connected with the first regeneration gas cooler; the first regeneration gas separator is used for carrying out gas-liquid separation on the regenerated gas.
5. The natural gas purification system of claim 2,
the TSA de-hydrocarbon guard also includes a first regeneration gas heater for heating the regeneration gas.
6. The natural gas purification system of claim 2,
the natural gas purification system further comprises a regenerated gas compression device, and the regenerated gas compression device is used for pressurizing gas output by the regenerated gas outlet pipe.
7. The natural gas purification system of claim 1,
the TSA dehydration and dealkylation device comprises:
at least two adsorption towers, wherein the adsorption towers are used for dehydrating and removing heavy hydrocarbon from the gas output by the MDEA deacidification device;
the regeneration gas feeding pipe is connected with the adsorption tower and is used for conveying regeneration gas to the adsorption tower; and
and the regeneration gas discharging pipe is used for outputting the regenerated gas in the adsorption tower.
8. The natural gas purification system of claim 7,
and the outlet of the regenerated gas discharge pipe is connected with the gas inlet of the TSA dehydration and dealkylation device.
9. The natural gas purification system of claim 8,
the TSA dehydration and dealkylation device further comprises a second regenerated gas cooler and a second regenerated gas separator which are sequentially connected, an outlet of the regenerated gas discharging pipe is connected with the second regenerated gas cooler, and the second regenerated gas separator is used for performing gas-liquid separation on the regenerated gas.
10. The natural gas purification system of claim 7, wherein the TSA dehydration de-hydrocarbon apparatus further comprises a second regeneration gas heater for heating the regeneration gas.
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